From: John Stone (
Date: Thu Jun 13 2013 - 13:12:44 CDT

  Which version of VMD are you using?

  John Stone

On Thu, Jun 13, 2013 at 02:57:30PM -0300, Alexandre Suman de Araujo wrote:
> Hi all
> I have a .psf file generated with CGenFF topology file and "Automatic
> PSF Builder" plugin from VMD. The obtained .psf file has atoms with
> atomtype field with different sizes, ranging from 4 to 6 characters, as
> expected. I use this .psf and the obtained .pdb in NAMD simulations with
> CGenFF force field parameter files without problems.
> If I load this .psf and .pdb in VMD, open tkconsole, build a selection
> with all atoms and use the writepsf command I obtain a new .psf where
> all atomtype fields has the same size: 4 characters. The last characters
> are lost and this .psf is broken, since the atomtypes of this .psf do
> not match anymore with the ones in the CGenFF parameters file.
> Is this a known limitation in writepsf routine or there is some way I
> can use it (with some option) where it writes the atomtypes correctly?
> Best regards
> Alexandre Suman de Araujo

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